High-rate quantum conferencing and secret sharing
Carlo Ottaviani, Cosmo Lupo, Riccardo Laurenza, Stefano Pirandola · arXiv (Cornell University) · 2017
We introduce a measurement-device independent star network which is conveniently based on continuous variable systems and standard linear optics. Here an arbitrary number of users send modulated coherent states to an untrusted relay where a generalized Bell detection creates multi-partite secret correlations. These correlations are then distilled into a shared secret key to implement a completely-secure quantum conference or, alternatively, a protocol of quantum secret-sharing. Our scheme is composably secure and able to achieve high rates with cheap optical implementation.